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syringe
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简易注射器，密封性不错，可以用来装润滑油一类液体。推杆需要包一层普通电工胶带，用来提高气密性。注射器带一个小盖子。注意：电工胶带缠绕一圈左右、不可太松也不可太紧，缠绕完成之后需整体放到水里浸泡一下再使用。实测吸水效果还行。
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